From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/i2c/busses/i2c-gpio.c | 522 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 522 insertions(+) create mode 100644 drivers/i2c/busses/i2c-gpio.c (limited to 'drivers/i2c/busses/i2c-gpio.c') diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c new file mode 100644 index 000000000..0e4385a9b --- /dev/null +++ b/drivers/i2c/busses/i2c-gpio.c @@ -0,0 +1,522 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Bitbanging I2C bus driver using the GPIO API + * + * Copyright (C) 2007 Atmel Corporation + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct i2c_gpio_private_data { + struct gpio_desc *sda; + struct gpio_desc *scl; + struct i2c_adapter adap; + struct i2c_algo_bit_data bit_data; + struct i2c_gpio_platform_data pdata; +#ifdef CONFIG_I2C_GPIO_FAULT_INJECTOR + struct dentry *debug_dir; + /* these must be protected by bus lock */ + struct completion scl_irq_completion; + u64 scl_irq_data; +#endif +}; + +/* + * Toggle SDA by changing the output value of the pin. This is only + * valid for pins configured as open drain (i.e. setting the value + * high effectively turns off the output driver.) + */ +static void i2c_gpio_setsda_val(void *data, int state) +{ + struct i2c_gpio_private_data *priv = data; + + gpiod_set_value_cansleep(priv->sda, state); +} + +/* + * Toggle SCL by changing the output value of the pin. This is used + * for pins that are configured as open drain and for output-only + * pins. The latter case will break the i2c protocol, but it will + * often work in practice. + */ +static void i2c_gpio_setscl_val(void *data, int state) +{ + struct i2c_gpio_private_data *priv = data; + + gpiod_set_value_cansleep(priv->scl, state); +} + +static int i2c_gpio_getsda(void *data) +{ + struct i2c_gpio_private_data *priv = data; + + return gpiod_get_value_cansleep(priv->sda); +} + +static int i2c_gpio_getscl(void *data) +{ + struct i2c_gpio_private_data *priv = data; + + return gpiod_get_value_cansleep(priv->scl); +} + +#ifdef CONFIG_I2C_GPIO_FAULT_INJECTOR +static struct dentry *i2c_gpio_debug_dir; + +#define setsda(bd, val) ((bd)->setsda((bd)->data, val)) +#define setscl(bd, val) ((bd)->setscl((bd)->data, val)) +#define getsda(bd) ((bd)->getsda((bd)->data)) +#define getscl(bd) ((bd)->getscl((bd)->data)) + +#define WIRE_ATTRIBUTE(wire) \ +static int fops_##wire##_get(void *data, u64 *val) \ +{ \ + struct i2c_gpio_private_data *priv = data; \ + \ + i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \ + *val = get##wire(&priv->bit_data); \ + i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \ + return 0; \ +} \ +static int fops_##wire##_set(void *data, u64 val) \ +{ \ + struct i2c_gpio_private_data *priv = data; \ + \ + i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \ + set##wire(&priv->bit_data, val); \ + i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \ + return 0; \ +} \ +DEFINE_DEBUGFS_ATTRIBUTE(fops_##wire, fops_##wire##_get, fops_##wire##_set, "%llu\n") + +WIRE_ATTRIBUTE(scl); +WIRE_ATTRIBUTE(sda); + +static void i2c_gpio_incomplete_transfer(struct i2c_gpio_private_data *priv, + u32 pattern, u8 pattern_size) +{ + struct i2c_algo_bit_data *bit_data = &priv->bit_data; + int i; + + i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); + + /* START condition */ + setsda(bit_data, 0); + udelay(bit_data->udelay); + + /* Send pattern, request ACK, don't send STOP */ + for (i = pattern_size - 1; i >= 0; i--) { + setscl(bit_data, 0); + udelay(bit_data->udelay / 2); + setsda(bit_data, (pattern >> i) & 1); + udelay((bit_data->udelay + 1) / 2); + setscl(bit_data, 1); + udelay(bit_data->udelay); + } + + i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); +} + +static int fops_incomplete_addr_phase_set(void *data, u64 addr) +{ + struct i2c_gpio_private_data *priv = data; + u32 pattern; + + if (addr > 0x7f) + return -EINVAL; + + /* ADDR (7 bit) + RD (1 bit) + Client ACK, keep SDA hi (1 bit) */ + pattern = (addr << 2) | 3; + + i2c_gpio_incomplete_transfer(priv, pattern, 9); + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_incomplete_addr_phase, NULL, fops_incomplete_addr_phase_set, "%llu\n"); + +static int fops_incomplete_write_byte_set(void *data, u64 addr) +{ + struct i2c_gpio_private_data *priv = data; + u32 pattern; + + if (addr > 0x7f) + return -EINVAL; + + /* ADDR (7 bit) + WR (1 bit) + Client ACK (1 bit) */ + pattern = (addr << 2) | 1; + /* 0x00 (8 bit) + Client ACK, keep SDA hi (1 bit) */ + pattern = (pattern << 9) | 1; + + i2c_gpio_incomplete_transfer(priv, pattern, 18); + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_incomplete_write_byte, NULL, fops_incomplete_write_byte_set, "%llu\n"); + +static int i2c_gpio_fi_act_on_scl_irq(struct i2c_gpio_private_data *priv, + irqreturn_t handler(int, void*)) +{ + int ret, irq = gpiod_to_irq(priv->scl); + + if (irq < 0) + return irq; + + i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); + + ret = gpiod_direction_input(priv->scl); + if (ret) + goto unlock; + + reinit_completion(&priv->scl_irq_completion); + + ret = request_irq(irq, handler, IRQF_TRIGGER_FALLING, + "i2c_gpio_fault_injector_scl_irq", priv); + if (ret) + goto output; + + wait_for_completion_interruptible(&priv->scl_irq_completion); + + free_irq(irq, priv); + output: + ret = gpiod_direction_output(priv->scl, 1) ?: ret; + unlock: + i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); + + return ret; +} + +static irqreturn_t lose_arbitration_irq(int irq, void *dev_id) +{ + struct i2c_gpio_private_data *priv = dev_id; + + setsda(&priv->bit_data, 0); + udelay(priv->scl_irq_data); + setsda(&priv->bit_data, 1); + + complete(&priv->scl_irq_completion); + + return IRQ_HANDLED; +} + +static int fops_lose_arbitration_set(void *data, u64 duration) +{ + struct i2c_gpio_private_data *priv = data; + + if (duration > 100 * 1000) + return -EINVAL; + + priv->scl_irq_data = duration; + /* + * Interrupt on falling SCL. This ensures that the master under test has + * really started the transfer. Interrupt on falling SDA did only + * exercise 'bus busy' detection on some HW but not 'arbitration lost'. + * Note that the interrupt latency may cause the first bits to be + * transmitted correctly. + */ + return i2c_gpio_fi_act_on_scl_irq(priv, lose_arbitration_irq); +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_lose_arbitration, NULL, fops_lose_arbitration_set, "%llu\n"); + +static irqreturn_t inject_panic_irq(int irq, void *dev_id) +{ + struct i2c_gpio_private_data *priv = dev_id; + + udelay(priv->scl_irq_data); + panic("I2C fault injector induced panic"); + + return IRQ_HANDLED; +} + +static int fops_inject_panic_set(void *data, u64 duration) +{ + struct i2c_gpio_private_data *priv = data; + + if (duration > 100 * 1000) + return -EINVAL; + + priv->scl_irq_data = duration; + /* + * Interrupt on falling SCL. This ensures that the master under test has + * really started the transfer. + */ + return i2c_gpio_fi_act_on_scl_irq(priv, inject_panic_irq); +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_inject_panic, NULL, fops_inject_panic_set, "%llu\n"); + +static void i2c_gpio_fault_injector_init(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev); + + /* + * If there will be a debugfs-dir per i2c adapter somewhen, put the + * 'fault-injector' dir there. Until then, we have a global dir with + * all adapters as subdirs. + */ + if (!i2c_gpio_debug_dir) { + i2c_gpio_debug_dir = debugfs_create_dir("i2c-fault-injector", NULL); + if (!i2c_gpio_debug_dir) + return; + } + + priv->debug_dir = debugfs_create_dir(pdev->name, i2c_gpio_debug_dir); + if (!priv->debug_dir) + return; + + init_completion(&priv->scl_irq_completion); + + debugfs_create_file_unsafe("incomplete_address_phase", 0200, priv->debug_dir, + priv, &fops_incomplete_addr_phase); + debugfs_create_file_unsafe("incomplete_write_byte", 0200, priv->debug_dir, + priv, &fops_incomplete_write_byte); + if (priv->bit_data.getscl) { + debugfs_create_file_unsafe("inject_panic", 0200, priv->debug_dir, + priv, &fops_inject_panic); + debugfs_create_file_unsafe("lose_arbitration", 0200, priv->debug_dir, + priv, &fops_lose_arbitration); + } + debugfs_create_file_unsafe("scl", 0600, priv->debug_dir, priv, &fops_scl); + debugfs_create_file_unsafe("sda", 0600, priv->debug_dir, priv, &fops_sda); +} + +static void i2c_gpio_fault_injector_exit(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev); + + debugfs_remove_recursive(priv->debug_dir); +} +#else +static inline void i2c_gpio_fault_injector_init(struct platform_device *pdev) {} +static inline void i2c_gpio_fault_injector_exit(struct platform_device *pdev) {} +#endif /* CONFIG_I2C_GPIO_FAULT_INJECTOR*/ + +static void of_i2c_gpio_get_props(struct device_node *np, + struct i2c_gpio_platform_data *pdata) +{ + u32 reg; + + of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay); + + if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", ®)) + pdata->timeout = msecs_to_jiffies(reg); + + pdata->sda_is_open_drain = + of_property_read_bool(np, "i2c-gpio,sda-open-drain"); + pdata->scl_is_open_drain = + of_property_read_bool(np, "i2c-gpio,scl-open-drain"); + pdata->scl_is_output_only = + of_property_read_bool(np, "i2c-gpio,scl-output-only"); +} + +static struct gpio_desc *i2c_gpio_get_desc(struct device *dev, + const char *con_id, + unsigned int index, + enum gpiod_flags gflags) +{ + struct gpio_desc *retdesc; + int ret; + + retdesc = devm_gpiod_get(dev, con_id, gflags); + if (!IS_ERR(retdesc)) { + dev_dbg(dev, "got GPIO from name %s\n", con_id); + return retdesc; + } + + retdesc = devm_gpiod_get_index(dev, NULL, index, gflags); + if (!IS_ERR(retdesc)) { + dev_dbg(dev, "got GPIO from index %u\n", index); + return retdesc; + } + + ret = PTR_ERR(retdesc); + + /* FIXME: hack in the old code, is this really necessary? */ + if (ret == -EINVAL) + retdesc = ERR_PTR(-EPROBE_DEFER); + + /* This happens if the GPIO driver is not yet probed, let's defer */ + if (ret == -ENOENT) + retdesc = ERR_PTR(-EPROBE_DEFER); + + if (PTR_ERR(retdesc) != -EPROBE_DEFER) + dev_err(dev, "error trying to get descriptor: %d\n", ret); + + return retdesc; +} + +static int i2c_gpio_probe(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv; + struct i2c_gpio_platform_data *pdata; + struct i2c_algo_bit_data *bit_data; + struct i2c_adapter *adap; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + enum gpiod_flags gflags; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + adap = &priv->adap; + bit_data = &priv->bit_data; + pdata = &priv->pdata; + + if (np) { + of_i2c_gpio_get_props(np, pdata); + } else { + /* + * If all platform data settings are zero it is OK + * to not provide any platform data from the board. + */ + if (dev_get_platdata(dev)) + memcpy(pdata, dev_get_platdata(dev), sizeof(*pdata)); + } + + /* + * First get the GPIO pins; if it fails, we'll defer the probe. + * If the SCL/SDA lines are marked "open drain" by platform data or + * device tree then this means that something outside of our control is + * marking these lines to be handled as open drain, and we should just + * handle them as we handle any other output. Else we enforce open + * drain as this is required for an I2C bus. + */ + if (pdata->sda_is_open_drain) + gflags = GPIOD_OUT_HIGH; + else + gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; + priv->sda = i2c_gpio_get_desc(dev, "sda", 0, gflags); + if (IS_ERR(priv->sda)) + return PTR_ERR(priv->sda); + + if (pdata->scl_is_open_drain) + gflags = GPIOD_OUT_HIGH; + else + gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; + priv->scl = i2c_gpio_get_desc(dev, "scl", 1, gflags); + if (IS_ERR(priv->scl)) + return PTR_ERR(priv->scl); + + if (gpiod_cansleep(priv->sda) || gpiod_cansleep(priv->scl)) + dev_warn(dev, "Slow GPIO pins might wreak havoc into I2C/SMBus bus timing"); + else + bit_data->can_do_atomic = true; + + bit_data->setsda = i2c_gpio_setsda_val; + bit_data->setscl = i2c_gpio_setscl_val; + + if (!pdata->scl_is_output_only) + bit_data->getscl = i2c_gpio_getscl; + bit_data->getsda = i2c_gpio_getsda; + + if (pdata->udelay) + bit_data->udelay = pdata->udelay; + else if (pdata->scl_is_output_only) + bit_data->udelay = 50; /* 10 kHz */ + else + bit_data->udelay = 5; /* 100 kHz */ + + if (pdata->timeout) + bit_data->timeout = pdata->timeout; + else + bit_data->timeout = HZ / 10; /* 100 ms */ + + bit_data->data = priv; + + adap->owner = THIS_MODULE; + if (np) + strscpy(adap->name, dev_name(dev), sizeof(adap->name)); + else + snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id); + + adap->algo_data = bit_data; + adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; + adap->dev.parent = dev; + adap->dev.of_node = np; + + adap->nr = pdev->id; + ret = i2c_bit_add_numbered_bus(adap); + if (ret) + return ret; + + platform_set_drvdata(pdev, priv); + + /* + * FIXME: using global GPIO numbers is not helpful. If/when we + * get accessors to get the actual name of the GPIO line, + * from the descriptor, then provide that instead. + */ + dev_info(dev, "using lines %u (SDA) and %u (SCL%s)\n", + desc_to_gpio(priv->sda), desc_to_gpio(priv->scl), + pdata->scl_is_output_only + ? ", no clock stretching" : ""); + + i2c_gpio_fault_injector_init(pdev); + + return 0; +} + +static int i2c_gpio_remove(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv; + struct i2c_adapter *adap; + + i2c_gpio_fault_injector_exit(pdev); + + priv = platform_get_drvdata(pdev); + adap = &priv->adap; + + i2c_del_adapter(adap); + + return 0; +} + +static const struct of_device_id i2c_gpio_dt_ids[] = { + { .compatible = "i2c-gpio", }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, i2c_gpio_dt_ids); + +static struct platform_driver i2c_gpio_driver = { + .driver = { + .name = "i2c-gpio", + .of_match_table = i2c_gpio_dt_ids, + }, + .probe = i2c_gpio_probe, + .remove = i2c_gpio_remove, +}; + +static int __init i2c_gpio_init(void) +{ + int ret; + + ret = platform_driver_register(&i2c_gpio_driver); + if (ret) + printk(KERN_ERR "i2c-gpio: probe failed: %d\n", ret); + + return ret; +} +subsys_initcall(i2c_gpio_init); + +static void __exit i2c_gpio_exit(void) +{ + platform_driver_unregister(&i2c_gpio_driver); +} +module_exit(i2c_gpio_exit); + +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_DESCRIPTION("Platform-independent bitbanging I2C driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:i2c-gpio"); -- cgit v1.2.3